java - android listview setadapter崩溃

Question

我是 Android 新手，我正在尝试在 ListView 上显示数组这是我设置 ListView 的 xml:

<ListView
        android:id="@+id/lv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

这里是MainActivity.java:

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {
    ListView listView ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ListView lv = (ListView) findViewById(R.id.lv);
        String[] values = new String[] { "Elemento 1", 
                                         "Elemento 2",
                                         "Elemento 3",
                                         "Elemento 4", 
                                         "Elemento 5", 
                                         "Elemento 6", 
                                         "Elemento 7", 
                                         "Elemento 8" 
                                        };

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
          android.R.id.text1, values);
        lv.setAdapter(adapter); 

        if (savedInstanceState == null) {
            getFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment()).commit();
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container,
                    false);
            return rootView;
        }
    }

}

所以，问题是，一切都很顺利，直到我写:

    lv.setAdapter(adapter); 

我运行应用程序，但它崩溃了，应用程序已停止。当我评论这部分代码时，它会运行，但显然没有显示任何内容。我在平板电脑上运行它，它在 ICS 上

提前致谢。

Answer 1

替换这一行:

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
      android.R.id.text1, values);

与

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, android.R.id.text1, values);